<?php
$gal_images = '';
foreach ( $images as $i => $image ) {
	$gal_images .= '<div class="penci-gal-item penci-gal-item-' . $i . '">' . Penci_Helper_Shortcode::get_image_holder_gal( $image, 'penci-thumb-480-320' ) . '</div>';
}
return '<div id="' . $unique_id . '" data-id="' . $unique_id . '" class="popup-gallery penci-popup-gallery">' . $gal_images . '</div>';